package com.geostar.constructionland.attachment.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class PingUtils {
	public static boolean ping(String ipAddress, int pingTimes, int timeOut) {
		BufferedReader in = null;
		Runtime r = Runtime.getRuntime(); // 将要执行的ping命令,此命令是windows格式的命令
		String pingCommand = "ping " + ipAddress + " -n " + pingTimes + " -w "
				+ timeOut;
		try { // 执行命令并获取输出
//			logger.info(pingCommand);
			Process p = r.exec(pingCommand);
			if (p == null) {
				return false;
			}
			in = new BufferedReader(new InputStreamReader(p.getInputStream())); // 逐行检查输出,计算类似出现=23ms
																				// TTL=62字样的次数
			int connectedCount = 0;
			String line = null;
			while ((line = in.readLine()) != null) {
				connectedCount += getCheckResult(line);
			} // 如果出现类似=23ms TTL=62这样的字样,出现的次数=测试次数则返回真
			return connectedCount == pingTimes;
		} catch (Exception ex) {
			ex.printStackTrace(); // 出现异常则返回假
			return false;
		} finally {
			try {
				in.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	// line含有=18ms TTL=16字样
	// 或line含有<1ms字样,
	// 说明已经ping通,返回1,否則返回0.
	private static int getCheckResult(String line) {
//		logger.info("控制台输出的结果为:"+line);
		int result = 0;
		Pattern pattern = Pattern.compile("(\\d+ms)(\\s+)(TTL=\\d+)", Pattern.CASE_INSENSITIVE);
		Matcher matcher = pattern.matcher(line);
		while (matcher.find()) {
			result = 1;
		}
		if (result != 1){
			Pattern pattern2 = Pattern.compile("<\\d+ms", Pattern.CASE_INSENSITIVE);
			Matcher matcher2 = pattern2.matcher(line);
			while (matcher2.find()) {
				result = 1;
			}
		}
		return result;
	}
}
